//package com.example.book.interceptor;
//
//import com.bit.book.constant.Constants;
//import com.bit.book.model.Result;
//import jakarta.servlet.http.HttpServletRequest;
//import jakarta.servlet.http.HttpServletResponse;
//import jakarta.servlet.http.HttpSession;
//import lombok.extern.slf4j.Slf4j;
//import org.springframework.stereotype.Component;
//import org.springframework.util.StringUtils;
//import org.springframework.web.servlet.HandlerInterceptor;
//import org.springframework.web.servlet.ModelAndView;
//
//import java.nio.charset.StandardCharsets;
//
//@Slf4j
//@Component
//public class LoginInterceptor implements HandlerInterceptor {
//    @Override
//    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        log.info("登录拦截器进行拦截校验...");
//        //判断用户是否登录
//        HttpSession session = request.getSession(false);
//        if (session==null || !StringUtils.hasLength((String)session.getAttribute(Constants.SESSION_LOGIN_USER_NAME))){
//            //用户未登录
//            response.setStatus(401);  //http状态码, 非业务码
//            response.setContentType("text/html;charset=utf-8");
//            response.getOutputStream().write("用户未登录".getBytes(StandardCharsets.UTF_8));
//
//            //如果返回json
////            response.setContentType("application/json;charset=utf-8");
////            Result result = Result.unlogin();
////            response.getOutputStream().print();
//            return false;
//        }
//        return true;
//    }
//
//    @Override
//    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
//        System.out.println("目标方法执行后...");
//    }
//
////    @Override
////    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
////        System.out.println("视图渲染之后执行....");
////    }
//}
